1 Installing the latest software for your telephone

2 Excluding repeater(s) as a source of interference

The following steps are only necessary if you use one or more repeaters to increase the DECT range of the FRITZ!Box and the background noise occurs when making calls with cordless telephones:

Unplug all of the repeaters.

Check whether you still hear background noise when you make a call with a cordless telephone while you are close to the FRITZ!Box.

If you no longer hear background noise now, follow the instructions given in our guide Background noise when using a DECT repeater. In this case, the repeater is either not correctly connected with the FRITZ!Box or it was not positioned correctly.

If you can still hear background noise, plug the repeater in again and proceed with the following section.

Re-registering the telephone

7 Configuring FRITZ!App Fon for Android

The following steps are only necessary if the problem occurs when using FRITZ!App Fon on an Android device:

Enabling alternative microphone

Start FRITZ!App Fon.

Tap "More" and then "Settings".

Tap the menu key on the telephone and then tap "Advanced".

Enable the option "Alternative microphone".

Adjusting the microphone volume

Start FRITZ!App Fon.

Tap "More" and then "Settings".

Tap the menu key on the telephone and then tap "Advanced".

Adjust the microphone volume step by step.

The FRITZ!Box's echo compensation and traffic shaping functions guarantee high speech quality. However, if you still experience an echo, delays or short dropouts, these are caused by the telephone being used, your Internet service provider or telephony provider, and cannot be influenced by the FRITZ!Box.